622144661 has 2 divisors, whose sum is σ = 622144662. Its totient is φ = 622144660.

The previous prime is 622144651. The next prime is 622144693. The reversal of 622144661 is 166441226.

It is an a-pointer prime, because the next prime (622144693) can be obtained adding 622144661 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620956561 + 1188100 = 24919^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 622144661 - 2¹⁸ = 621882517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (622144651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311072330 + 311072331.

It is an arithmetic number, because the mean of its divisors is an integer number (311072331).

Almost surely, 2^622144661 is an apocalyptic number.

It is an amenable number.

622144661 is a deficient number, since it is larger than the sum of its proper divisors (1).

622144661 is an equidigital number, since it uses as much as digits as its factorization.

622144661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 32.

The square root of 622144661 is about 24942.8278468982. The cubic root of 622144661 is about 853.6839692491.

Adding to 622144661 its reverse (166441226), we get a palindrome (788585887).

The spelling of 622144661 in words is "six hundred twenty-two million, one hundred forty-four thousand, six hundred sixty-one".